JP2003179421A - Antenna for portable wireless device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna of a portable wireless device having a simple constitution for realizing superior antenna characteristics, by reducing an unnecessary leakage current on the body of the wireless machine when the antenna is stored. <P>SOLUTION: A first antenna element 3 freely adjustable in an extended or stored state and a second antenna element 4 mounted in an isolated state with the first antenna element 3 are provided in the wireless device body 1. In the extended state of the first antenna element 3, the base edge part 3a of the first antenna element is connected to an antenna power feed means 6, and at the same time an upper edge part 3b of the first antenna element is connected to a ground connection means 8 and is connected with the ground of the wireless device body 1. Then, the first antenna element functions as a ground line when the antenna is stored, so the leakage current on the body can be prevented. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna for a mobile wireless device such as a mobile phone, and more particularly, to prevent deterioration of antenna characteristics when an antenna mounted in a housing of a wireless device is retractable. The present invention relates to an antenna for a portable wireless device that can perform.

[0002]

2. Description of the Related Art In recent years, mobile wireless devices such as mobile phones have been increasingly required to be small and lightweight, and such mobile wireless antennas have good antenna characteristics while maintaining portability. In order to obtain, small antennas that can be pulled out / stored are often used. FIG. 10 and FIG. 11 are cross-sectional views showing a configuration of an antenna device described in Japanese Patent Laid-Open No. 7-86819 as an example of such a conventional antenna for a portable wireless device.

In FIGS. 10 and 11, a radio casing 91 of a portable radio has an antenna 92, a feeding ring 96, a radio circuit board 98 and the like. The antenna 92 includes a first antenna element (radiating conductor) 93 formed of a conductive linear conductor, and a second antenna element 93 that is arranged apart from the upper end of the first antenna element 93 and is formed of a coil-shaped conductor. Antenna element (radiation conductor) 94, and the first antenna element 93 and the second antenna element 94 are electrically insulated by an insulating member 95. First antenna element 93
The first power feeding connecting member 93a is connected to the lower end of the second antenna element 94, and the second power feeding connecting member 94a is connected to the lower end of the second antenna element 94. The power feeding ring 96 is embedded in the wireless device housing 91 and electrically connected to the wireless circuit board 98 via the power feeding means 97.

In FIG. 10, an antenna 92 has a radio housing 91.
FIG. 11 is a diagram showing a state in which the first power feeding connection member 93a is connected to the power feeding ring 96 and the first antenna element 93 is configured on the wireless circuit board 98 (not shown). It is connected to the. At this time, the second antenna element 94 is electrically insulated from the first antenna element 93, and only the first antenna element 93 operates as an antenna. On the other hand, FIG. 11 is a diagram showing a state in which the antenna 92 is housed inside the radio housing 91, and the second antenna element 94 is connected to the power feeding ring 96 and protrudes from the radio housing 91. The second antenna element 94 is connected to a power feeding circuit (not shown) formed on the wireless circuit board 98. At this time, the first antenna element 93 is electrically insulated from the second antenna element 94 by the insulating member 95.
Only acts as an antenna. First antenna element 9
By appropriately selecting the electrical length of 3 and the electrical length of the second antenna element 94, the impedance of the antenna 92 seen from the feeding circuit in the pulled-out state and the housed state becomes approximately the same at the used frequency, and the matching circuit of the feeding circuit is obtained. Thus, good matching characteristics with the transmission / reception circuit can be obtained.

[0005]

In recent years, the capacity of wireless systems has been increasing, and systems using a wide frequency band have been put into practical use. Along with this, wide band antenna characteristics have been achieved. Characteristics are required. -Generally, the antenna 92 as shown in the prior art is
When the electric lengths of the first antenna element (radiation conductor) 93 and the second antenna element (radiation conductor) 94 are about 1/4 wavelength, the antenna characteristics are wideband, and the electric length is 1 / wavelength.
The characteristic becomes narrower as it approaches two wavelengths.

In the antenna of the prior art shown in FIGS. 10 and 11, when the antenna electrical length in the antenna withdrawn state and the antenna electrical length in the antenna withdrawn state are configured to have the same length, that is, the first antenna element 93 and the second antenna element Antenna element 94
Is the same electrical length, the second antenna element 94 is formed in a coil shape, so that the antenna characteristic becomes a narrow band characteristic. Therefore, in order to obtain similar band characteristics in the antenna characteristics in the antenna extended state and the housed state, it is necessary to make the electrical length of the second antenna element 94 shorter than the electrical length of the first antenna element 93. 1 /
The closer to 4 wavelengths, the broader the antenna characteristics when stored.

However, when the electric length of the antenna element is set to about 1/4 wavelength in order to obtain a wide band antenna characteristic, it is on the ground of the radio circuit board 98 or the radio housing 91.
There is a problem that unnecessary leakage current is likely to flow on the inner ground, and thereby the antenna characteristics are strongly influenced by the size and shape of the housing. In addition, when a large leakage current flows on the radio casing as described above, when the radio casing is held in the hand during actual use, or when the radio casing is used near the head, The antenna characteristics are greatly deteriorated due to the strong influence of the hands and head that come into contact with the radio housing,
There is a problem that the radiation characteristics change greatly. Also,
On the contrary, when the leakage current becomes large, there is a problem that the adverse effect on the human head (power absorption amount at the head. SAR value) becomes large when the housing is brought close to the head during actual use.

Further, as a method of reducing the leakage current on the housing of the radio device as described above, there is known a method of providing a ground wire having a length of about 1/4 wavelength on the housing ground.
In this method, in addition to the antenna element, it is necessary to construct the ground wire which is the above-mentioned resonance system element inside the housing, which makes the structure complicated and requires a space for incorporating the ground wire. Therefore, there is a problem from the viewpoint of downsizing the radio housing.

The present invention has been made in view of the above problems, and in an antenna for a portable radio that can be pulled out / stored, it flows on the radio housing in the antenna housed state or on the circuit board. It is an object of the present invention to provide an antenna for a portable wireless device that suppresses unnecessary leakage current and obtains stable antenna characteristics.

[0010]

According to a first aspect of the present invention, there is provided an antenna for a portable wireless device, a housing for a wireless device, a first antenna element mounted in the housing for housing the wireless device, and A second antenna element electrically insulated from the first antenna element, a power supply connection means for supplying power to the first and second antenna elements, and a ground connection means; In the pulled-out state of the antenna element, the feeding connection means is connected to the base end portion of the first antenna element, and in the housed state of the first antenna element, the feeding connection means is the second Is connected to the base end of the antenna element and the upper end of the first antenna element is connected to the ground inside the radio housing through the ground connection means.

In the housed state of the first antenna element,
The second antenna element is supplied with power through the connecting means for power supply, and the other end of the first antenna element is connected to the ground inside the wireless device housing through the ground connecting means, so that unnecessary leakage occurs. It acts as a ground wire to prevent current from flowing over the radio housing.

According to a second aspect of the present invention, there is provided an antenna for a portable wireless device according to the first aspect, wherein the first antenna element has an electrical length equal to that of the second antenna element. Characterized by being longer than long.

Short with respect to wavelength (from 1/4 wavelength to 1/2
In the case of the antenna electrical length (of the wavelength range), the shorter the antenna element length, the larger the unnecessary leakage current flowing into the radio housing. Therefore, when the antenna is housed, the second antenna element with the short electrical length is fed. However, the leakage current can be suppressed by the ground wire effect of the first antenna element, and when the antenna is pulled out, the first antenna element with a long electrical length is fed, so there is no leakage even if there is no ground wire. The current is kept small.

A portable radio device antenna according to a third aspect of the present invention is the portable radio device antenna according to the first and second aspects of the present invention, wherein the first antenna element has a multi-stage structure including a plurality of conductive members. The electric length is long in the pulled-out state, and the electric length is short in the stored state.

When the antenna is pulled out, the multistage antenna element operates in an extended state, that is, it operates as an antenna element having a long electric length. Therefore, unnecessary leakage current flowing into the housing is suppressed to a small level, and in the antenna housed state. The first antenna element, which is connected to the ground, can act as a ground wire having a short electrical length in a state where the multi-stage antenna element is contracted, and a better leakage current suppressing effect can be obtained.

A portable radio device antenna according to a fourth aspect of the present invention is the portable radio device antenna according to the first, second and third inventions, wherein the ground connection means is an upper end portion of the first antenna element. And the ground in the radio housing are connected via a capacitance.

When the antenna is housed, the first antenna element and the ground inside the radio housing are electrically connected by capacitive coupling, so that a leakage current that acts as a ground wire and flows onto the housing is suppressed. To be done.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG.
~ It demonstrates based on the Example shown in FIG. (First Embodiment) FIGS. 1 and 2 are sectional perspective views showing an antenna for a portable wireless device of a first embodiment of the present invention. Figure 1
The antenna is pulled out, and FIG. 2 shows the antenna housed. The antenna 2 for a portable wireless device shown in FIGS. 1 and 2 is the same as the first antenna element (radiation conductor) 3 formed of a linear conductor having an electric length of about 1/4 to 3/8 wavelength. The second antenna element (radiation conductor) 4 is formed of a coiled conductor having an electric length of about 1/4 to 3/8 wavelength, and the upper end portion 3b of the first antenna element 3 and the second antenna element 3 are provided. The antenna element 4 is connected to the base end portion 4a in an electrically insulated state by the insulating member 5, and the first antenna element 3 is attached to the radio housing 1 so that it can be pulled out / stored. There is. The radio housing 1 has an antenna power feeding means 6 for feeding the antenna 2, and a ground connecting means 8 provided in the vicinity of the antenna power feeding means 6, and also has a microphone, a speaker, a key, an LCD (whichever is used). Each component having a function necessary for the mobile wireless terminal such as (not shown) is attached.

With reference to FIG. 1 and FIG.
The antenna operation in each stored state will be described. In the extended state of FIG. 1, the first antenna element 3
The base end portion 3a of is connected to the power feeding means 6, whereby the first antenna element 3 is connected to the matching circuit 7 via the power feeding means 6 and operates as an antenna. The matching circuit 7 may be formed on the wireless circuit board, and the power feeding means 6 may be any one that can ensure the electrical connection between the antenna feeding contact on the wireless circuit board and the first antenna element 3. , A coil spring, a conductive cushion material, or the like. At this time, since the second antenna element 4 is electrically insulated, it does not operate as an antenna. In the housed state of FIG. 2, the base end portion 4a of the second antenna element 4 is connected to the power feeding means 6, the second antenna element 4 operates as an antenna, and the upper end portion 3 of the first antenna element 3 is operated.
b is electrically connected to the ground inside the housing through the ground connection means 8. The earth connection means 8 may be any means that can reliably connect to the earth in the housing, and is composed of a leaf spring, a spring spring, a conductive cushion, or the like.

The first antenna element 3 has an electric length of about 1/4.
The wavelength is about the wavelength, and in the housed state, the upper end 3b is connected to the ground and the base end 3a is an open end, so that it operates as a ground wire, thereby suppressing unnecessary leakage current flowing on the housing. When the electric lengths of the first antenna element 3 and the second antenna element 4 are about the same, the second antenna element 4 is formed in a coil shape in consideration of the designability at the time of storage, and therefore, the narrow band. It becomes a characteristic. Therefore, in order to obtain a similar characteristic (band), it is desirable that the electrical length of the first antenna element 3 be longer than that of the second antenna element 4. That is, in the present embodiment, it is most effective to set the first antenna element 3 to be longer than 1/4 wavelength and set the electrical length of the second antenna element 4 to about 1/4 wavelength. is there. At this time, since the electric length of the operating antenna in the pulled-out state is longer than that in the housed state, the leakage current to the housing is originally small. Although the leakage current to the body is large, the leakage current is reduced by the above-described ground wire effect, and good antenna characteristics that are not easily influenced by the housing can be realized. The second antenna element 4 may be configured by a folded pattern or may be formed in a zigzag shape.

(Second Embodiment) FIGS. 3 and 4 are cross-sectional perspective views showing an antenna for portable radio equipment according to a second embodiment of the present invention. FIG. 3 shows the antenna withdrawn, and FIG. 4 shows the antenna housed. The portable radio antenna of the second embodiment is
Lower conductor 3-where the first antenna element 3 is a conductive member
1 and the upper conductor 3-2 have an expandable and contractible multi-stage structure. The second antenna element 4 is formed of a coil-shaped conductor having an electrical length of about 1/4 to 3/8 wavelength, and the upper end portion 3b of the first antenna element 3 and the second antenna element 4 are formed.
The first antenna element 3 is attached to the radio housing 1 so as to be pulled out / storable, while being connected to the base end portion 4a of the device in an electrically insulated state by the insulating member 5.

With reference to FIG. 3 and FIG.
The antenna operation in each stored state will be described. In the extended state of FIG. 3, the first antenna element 3
Is pulled out from the radio housing 1 and the upper conductor 3-2
Is drawn from the lower conductor 3-1 and the electrical length of the first antenna element 3 is the sum of the electrical lengths of the lower conductor 3-1 and the upper conductor 3-2. The base end 3a of the lower conductor 3-1 is connected to the matching circuit 7 via the power feeding means 6 and operates as an antenna. At this time, for example, the lower conductor 3-1
By setting the electrical length of the upper conductor 3-2 to about 1/4 wavelength, the first antenna element 3 operates as an antenna of about 1/2 wavelength in the pulled-out state.
Good antenna characteristics can be obtained without leakage current flowing upward.

In the housed state of FIG. 4, the first antenna element 3 is housed in the radio housing 1 and the upper conductor 3-2 is housed in the lower conductor 3-1. The electrical length of 3 is approximately the same as the electrical length of the lower conductor 3-1, and in the case of the above example, it is about 1/4 wavelength. The second antenna element 4 is connected to the power feeding means 6 and operates as an antenna, and at the same time, the upper end portion 3b of the upper conductor 3-2 is connected to the ground inside the housing through the ground connecting means 8, and the first antenna element 3 is connected. Acts as a ground line. As described above, since the electrical length at this time is about ¼ wavelength, the effect of suppressing the leakage current is very large, and good antenna characteristics can be obtained.

As described above, in the portable radio device antenna according to the second embodiment, the first antenna element 3 has the expandable and retractable multi-stage structure, so that the housing size is small and the antenna storage space is small. In the terminal as well, there is an effect that an antenna that operates with a length greater than or equal to the housing length can be configured when the terminal is pulled out, and further, by setting the electrical length of the first antenna element 3 at the time of storage to about 1/4 wavelength, storage is possible. There is a special effect that adverse effects due to unnecessary leakage current can be suppressed.

When the electrical length of the operating antenna in the pulled out state and the housed state is greatly changed, the input impedance characteristic greatly changes. Therefore, in the matching circuit 7, the matching circuit parameter is switched by the switch depending on the antenna state (drawing / housed). By switching, it is possible to realize better antenna characteristics.

(Third Embodiment) FIG. 5 is a sectional front view of an essential part showing an antenna for portable radio equipment according to a third embodiment of the present invention. FIG. 5 (A) shows the antenna withdrawn, and FIG. (B)
Indicates the antenna storage state. In the portable radio device antenna shown in FIG. 5, the first antenna element 9 and the second antenna element 10 are both formed of linear conductors, and the first antenna element 9 is fed in the drawn state and is stored in the housed state. The second antenna element 10 is fed with power, and the upper end portion 9b of the first antenna element 9 is connected to the housing ground via the capacitance 11. Capacitance 1 as ground connection means
By using 1, the first antenna element 9 acting as a ground wire exhibits a capacitive impedance, so that even if the electrical length of the ground wire at this time is longer than ¼ wavelength, it is directly connected to the housing ground. In this case, the electric length can be equivalent to that of a ground wire whose electric length is 1/4 wavelength. That is, by using the capacitive coupling as the ground connecting means, a large leakage current suppressing effect can be obtained even if the electrical length of the first antenna element 9 is longer than ¼ wavelength.

As a result, even when the electrical length of the first antenna element 9 is set to about 3/8 wavelength, which allows the antenna characteristics in a drawn out state / stored state to be well balanced, the ground state at the time of storage is set. The line effect can be increased, and good antenna characteristics can be realized in both the drawn state and the housed state.

FIG. 6 and FIG. 7 are sectional views showing a concrete structure of the earth connecting means by electrostatic capacitance in the antenna for portable radio equipment of the third embodiment. FIG. 6 shows the antenna withdrawn, and FIG. 7 shows the antenna housed. In the antenna extended state of FIG. 6, the base end portion 3a of the first antenna element 3 is electrically connected by being fitted to the power feeding ring 12 of the cylindrical conductor embedded in the radio housing 1, The power feeding ring 12 is connected to a matching circuit 14 mounted on the wireless circuit board 15 via a power feeding connecting means 13 formed of a leaf spring, a coil spring, or the like.

In the housed state of the antenna of FIG. 7, the second antenna element 4 is fed with power by feeding the base end 4a of the coiled second antenna element 4 into the feeding ring 12. Inside the ground connection ring 16 of a cylindrical conductor, which is provided in the lower part of the ring 12 for a space,
The upper end portion 3b of the first antenna element 3 is inserted in a non-contact manner, the earth connection ring 16 and the upper end portion 3b of the first antenna element 3 are capacitively coupled, and the earth connection ring 16 is a leaf spring or a coil. It is grounded to a ground pattern on the wireless circuit board 15 via a ground connection means 17 composed of a spring or the like. As described above, since the earth connection ring 16 and the upper end portion 3b of the first antenna element 3 are coaxial, a large capacitance value can be obtained, and the ground wire effect during storage can be increased. Good antenna characteristics can be realized in both the pulled-out state and the stored state.

Further, in the first and second embodiments,
At the time of pulling out / storing operation, two parts, that is, the power supply part and the ground connection part, are required to conduct / contact with the antenna part. However, in the third embodiment, the contact part is constituted by only one part of the power supply part. Therefore, the antenna mechanism can be simplified and the cost can be reduced. Further, the power supply ring 12 and the ground connection ring 16 are made into the same component structure with an insulating member interposed therebetween, whereby the structure can be further simplified.

(Fourth Embodiment) FIGS. 8 and 9 are sectional views showing the detailed structure of the antenna for portable radio equipment of the fourth embodiment of the present invention. FIG. 8 shows the antenna withdrawn, and FIG. Indicates the antenna storage state. The antenna for a portable wireless device shown in FIGS. 8 and 9 uses the ground pattern 18 formed on the wireless circuit board 15 as a ground connection means. In the antenna housed state of FIG. 9, the upper end portion 3b of the first antenna element 3 is
A ground pattern 18 is formed on the wireless circuit board 15 so as to overlap with the
The upper end 3b of the first antenna element 3 has the ground pattern 1
Connected to ground via 8. According to the present embodiment, the ground connection means can be formed only by the ground pattern 18 on the wireless circuit board, which has the effect of further simplifying the configuration and reducing the cost.

[0032]

As described above, the antenna for a portable radio device according to the present invention, which can be pulled out / stored freely, is
While feeding power to the second antenna element, the first antenna element acts as a ground wire by connecting the upper end of the first antenna element to the ground in the radio housing via the ground connection means. It is possible to suppress unnecessary leakage current on the radio housing during storage, and it is possible to realize good antenna characteristics with a simple configuration while preventing deterioration of antenna characteristics during storage of the antenna.

Since the electric length of the first antenna element is longer than the electric length of the second antenna element, the electric length of the antenna in the antenna extended state is longer than that in the antenna housed state. It operates as an antenna with a long electrical length when the antenna is pulled out, and unnecessary leakage current that flows onto the radio housing is reduced. In the antenna housed state, an antenna with a short electrical length is fed, but the first antenna element By acting as a ground wire, leakage current can be suppressed, and good antenna characteristics that are well balanced in the drawn state / housed state can be provided.

Further, since the first antenna element has a multistage structure in which it can be expanded and contracted by a plurality of conductive housing members, the electric length of the first antenna element is extended to about 1/2 wavelength in the antenna extended state. However, when the antenna is housed, the electrical length can be shortened to about 1/4 wavelength. As a result, when the antenna is pulled out, it operates as an antenna with a small unnecessary leakage current to the radio housing, and when the antenna is stored, the first antenna element has the maximum effect of suppressing the leakage current. Of the antenna and can improve both the antenna characteristics in the pulled-out state / in the housed state.
That is, by changing the length of the first antenna element in the pulled-out state / stored state, it is possible to design the antenna with a higher degree of freedom.

Further, by using the electrostatic capacity coupling as the earth connecting means, it is possible to simplify the constitution of the power feeding portion and the earth connecting portion. Further, in the housed state, the first antenna element is connected to the ground by capacitive coupling, so that the length of the first antenna element is 1/4.
Even when the wavelength is longer than the wavelength, it exhibits a capacitive impedance and is coupled to the ground, and a good ground wire effect is obtained. Therefore, the electric length of the antenna can be lengthened even in the pulled-out state, and the antenna electric length can be made longer in the pulled-out state / housed state. This makes it possible to provide an antenna having good characteristics.

[Brief description of drawings]

FIG. 1 is a cross-sectional perspective view showing an antenna for a portable wireless device (in a pulled-out state) according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional perspective view showing an antenna for a portable wireless device (stored state) according to the first embodiment of the present invention.

FIG. 3 is a sectional perspective view showing an antenna for a portable wireless device (in a pulled-out state) according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional perspective view showing an antenna for a portable wireless device (stored state) according to a second embodiment of the present invention.

5A and 5B are cross-sectional views showing an antenna for a portable wireless device of a third embodiment of the present invention, FIG. 5A showing the antenna withdrawn state and FIG. 5B showing the antenna housed state.

FIG. 6 is a cross-sectional view showing a specific configuration of a ground connection means by capacitance in an antenna for a portable wireless device (in a pulled-out state) according to a third embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a specific configuration of a grounding connection means by capacitance in an antenna for a portable wireless device (stored state) according to a third embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a specific configuration of a ground connection means by capacitance in an antenna for a portable wireless device (in a pulled-out state) according to a fourth embodiment of the present invention.

FIG. 9 is a cross-sectional view showing a specific configuration of a ground connecting means by electrostatic capacitance in an antenna for a portable wireless device (stored state) according to a fourth embodiment of the present invention.

FIG. 10 is a cross-sectional view of a conventional portable wireless device antenna (in a pulled-out state).

FIG. 11 is a cross-sectional view of a conventional portable wireless device antenna (stored state).

[Explanation of symbols]

1, 91 ... Radio housing, 2, 92 ... Portable radio antenna, 3, 9, 93 ... First antenna element (radiation conductor),
3a, 9a ... Base part (of the first antenna element) 3b,
9b ... upper end portion (of the first antenna element), 4, 10, 9
4 ... Second antenna element (radiation conductor) 4a, 10a ...
Base end portion (of second antenna element) 5,95 ... Insulating member, 6,97 ... Antenna feeding means, 7,14 ... Matching circuit, 8 ... Ground connection means, 11 ... Capacitance, 12,96
... power supply ring, 13 ... power supply connection means, 15, 98 ...
Radio circuit board, 16 ... Ground connection ring, 17 ... Ground connection means, 18 ... Ground pattern.

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04M 1/00 H04M 1/00 A 1/02 1/02 C 1/725 1/725 F term (reference) 5J046 AA01 AA03 AA07 AB06 DA03 FA04 FA08 5J047 AA01 AA03 AA07 AB06 FA01 FA02 FA09 FA12 5K011 AA04 AA06 AA16 DA02 JA01 KA04 5K023 AA07 BB06 LL05 5K027 AA11 BB03 MM04

Claims (4)

[Claims] 1. A radio housing, a first antenna element mounted in the radio housing so as to be able to move in and out, and a second antenna electrically insulated from the first antenna element. An element, a power supply connection means for supplying power to the first and second antenna elements, and a ground connection means, and in the pulled-out state of the first antenna element, the power supply connection means is the first Is connected to the base end of the antenna element of
In the housed state of the first antenna element, the feeding connection means is connected to the base end portion of the second antenna element, and the upper end portion of the first antenna element is connected via the ground connection means. An antenna for a portable wireless device, which is connected to the ground inside the wireless device housing. 2. The antenna for a portable wireless device according to claim 1, wherein the electrical length of the first antenna element is longer than the electrical length of the second antenna element. 3. The first antenna element has a multi-stage structure including a plurality of conductive members, and has a long electric length in a drawn state and a short electric length in a stored state. Alternatively, the antenna for portable wireless device described in 2. 4. The ground connecting means connects the upper end of the first antenna element and the ground inside the radio housing with capacitance.
An antenna for a portable wireless device according to any one of the above.